Suchergebnisse

AbstractUK water debt has increased rapidly and has become a significant management issue for most water companies, constraining investment in necessary environmental interventions. Debt is characterised as debt penetration (percentage of customers in debt) and debt intensity (average size of debt per indebted customer). Actual debt characteristics in a water company can be plotted by intensity and penetration to demonstrate performance differences between companies, changes over time and performance relative to national norms. Using the relationships between debt and deprivation, the expected debt performance can be plotted. Using the expected position as a benchmark, the company performance can be evaluated and the remedial strategies can be targeted (if required) towards reduction of frequency and size of debt. The distance between actual and expected values is used as a metric of the requirement for additional debt management investment. Examples of these debtor plots for a range of anonymous companies are presented.

AbstractResiduum lodges comprise small dams constructed on feeder streams immediately before they enter a reservoir, behind which ponds form, where sediment is deposited. Despite their construction on many impoundment reservoirs (IRE) and catchwaters, little research has previously investigated their efficacy at removing sediments from feeder streams. The current pilot study has, therefore, been carried out at an IRE supplying Halifax, West Yorkshire, UK, where a residuum lodge was recently cleaned out. Sediment concentrations reaching the reservoir were reduced by up to 42% although no certain impacts were noted on the other water quality variables that were measured. Moreover, it was found that the clearance operation did not result in the release of excessive quantities of sediment into the reservoir. It was estimated that the cleared residuum lodge would take 12 years to refill. A survey of other residuum lodges in the Yorkshire region showed there to be considerable differences in their remaining capacities.